Description: Grinding wheel is one of the most widely used abrasive tools, which can rotate at high speed. It can be used for coarse grinding, semi-finishing, fine grinding, grooving and cutting of various metal or non-metal workpieces. Specifications: Material: Aluminum oxide Quantity: 10pcs Grit Size: 60 Revolving Speed: 3800rpm Inner Diameter: 16mm/0.63in Outer Diameter: 100mm/3.94in Thickness: 6mm/0.24in Weight: Approx. 522g Package Includes: 10 x Grinding Wheel Note: 1. Due to the difference between the monitors and light effect, the picture may not reflect the actual color of the item. 2. Please allow 1-3mm error due to manual measurement. Thanks for your understanding.